Matlab SPI write with ESS

[sanjosanjo]

I'm having trouble using the .NET Matlab interface to write to the SPI interface using the extended mode (ESS). I verified the standard SPI write was working using the example code, then modified it to try ESS (see below). I get the error "No method 'SPI_Transfer_Ess' with matching signature found for class 'Xdimax.Sub20'


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disp 'SUB-20 SPI sample. Configures SPI and exchanges data with SPI slave(SS=2)'
TransferSize = 3;
NET.addAssembly('C:\Program Files\SUB-20\bin\sub20dnc.dll');
sub20 = Xdimax.Sub20();
% Open first available SUB-20 device
if ~ sub20.Open(0)
break;
end
% Set SPI configuration
if ~ sub20.SPI_SetConfig(sub20.SpiEnable + sub20.SpiCpolRise + ...
sub20.SpiSmplSetup + sub20.SpiMsbFirst + sub20.SpiClk_4MHz )
break;
end
% Create .NET data array
Data = NET.createArray('System.Byte', TransferSize);
% Fill up the array with data bytes to be sent
Data.Set(0, hex2dec('2a'));
Data.Set(1, hex2dec('2b'));
Data.Set(2, hex2dec('2c'));
% Exchange data with SPI slave(SS=2). SS signal stays high
%if ~ sub20.SPI_Transfer(Data, 2, sub20.SpiSS_H)
% break;
%end
if ~ sub20.SPI_Transfer_Ess(Data, 2, '2L^-vL^-v')
break;
end

% Close SUB-20 device
sub20.Close()

[serg]

Hi sanjosanjo,

The SPI_Transfer_Ess method accepts two parameters: data array and a control string. The SS is controlled by specifying 0,1,2,3 in the control string. See the 3.5.3 sub_spi_transfer_ess section of the User Manual for more info. We are going to add the _Ess methods into the .NET document in the next release. Besides the SPI_Transfer_Ess you can also use the following methods:
SPI_Read_Ess(Array Data, String ss_mode)
SPI_Write_Ess(Array Data, String ss_mode)
So, in your code just remove the second parameter(2)

Code: Select all

  
   if ~ sub20.SPI_Transfer_Ess(Data, '2L^-vL^-v')
       break;
    end

[sanjosanjo]

Okay, things are improving. The function executes and I get SPI activity as described by '4vHvHvHv-^v', which is the sequenceI need. However, the SS1 pin has the activity. I've tried
'1vHvHvHv-^v', '2vHvHvHv-^v', '3vHvHvHv-^v', '4vHvHvHv-^v' and '5vHvHvHv-^v' and the activity is always on the SS1 pin, never any other pin.

Any ideas?

[serg]

Hi sanjosanjo,
Yes, this is a bug in the firmware which we already fixed but didn't release yet. Please update your firmware with the attached file. This should fix the problem. Sorry for any inconvenience.